Study findings indicate that cyanobacteria and cyanotoxins were not associated with mussel mortality at the concentrations present in Lake Erie during a recent study (2013-15), but mussel growth was lower at sites with greater microcystin concentrations.
Lake Erie experienced major changes in its cyanobacterial communities in the early 2000s. After being absent for most of the late 1980s and 1990s, cyanobacteria have again become prevalent seasonally in the western basin of Lake Erie, which provides drinking water to large coastal communities. These cyanobacterial blooms have resulted in episodic drinking water shutdowns along Lake Erie and the creation of a large international effort to identify causes and potential management strategies to minimize adverse effects to humans and other organisms.
Lake Erie supports an important commercial and cultural fishery. These fisheries rely in part on production (growth and survival) of mussels in the lake, and there is concern that cyanobacterial blooms and associated cyanotoxins could reduce production of mussels and ultimately affect the fishery.
Cyanobacteria produce several different classes of cyanotoxins, including anatoxin, cylindrospermopsin, microcystin, and saxitoxin. Microcystin is the only toxin known to regularly occur in Lake Erie. Mussels often are not affected by microcystin at concentrations that cause mortality of other organisms such as zooplankton. However, more recent studies have shown that microcystin can cause inflammatory responses and immune system alterations in dreissenid mussels when present either in dissolved form or in the cells of ingested cyanobacteria. This is of particular interest in Lake Erie, where invasive dreissenid mussels comprise the majority of secondary production.
Scientists assessed if cyanobacterial abundance indices and cyanotoxin concentrations were associated with secondary production by mussels in Lake Erie. Three indices of mussel production (growth of a native unionid mussel, the size of young-of-year invasive dreissenid mussels, and the overall mass of colonizing animals on a Hester-Dendy sampler) were measured, and indices of cyanobacterial abundance (biovolume, chlorophyll-a concentration, and cyanotoxin concentration) at 35 stations in the western Basin of Lake Erie during 2013 through 2015.
The results of this study indicate that cyanobacterial abundance and microcystin did not cause mussel mortality at the concentrations detected in Lake Erie during 2013-2015. Measures of cyanobacterial abundance were only weakly associated with the impaired growth of mussels. In contrast, mussel growth was lower at sites with greater microcystin concentrations. This information suggests that in Lake Erie, the poor food quality of cyanobacteria has only a small influence, while microcystin concentration has a larger influence, on mussel growth. Though this study largely reflects effects of cyanobacteria on mussels, rather than all secondary producers, the invasive dreissenid mussels make up a very high proportion of secondary production in the Western Basin of Lake Erie. These mussels do provide resources and a pathway for biomass to move to higher trophic levels in the food web.
This study is part of a larger USGS goal to provide the science needed to understand how to economically and effectively minimize the risk, if any, to the health of humans and other organisms exposed to toxins through inhalation, dermal, ingestion, and other exposure routes. Future steps include the need to understand the mechanisms responsible for reduced native mussel growth associated with microcystin and other cyanotoxins in our Nations water resources.
The USGS Toxic Substances Hydrology Program and the Great Lakes Restoration Initiative funded this study.
Related science listed below.
Toxins and Harmful Algal Blooms Science Team
Satellite Data Used to Estimate and Rank Cyanobacterial Bloom Magnitude in Florida and Ohio Lakes—Developing Tools to Protect Human and Wildlife Health from Cyanotoxin Exposure
Mixtures of Algal Toxins Present Prior to and After Formation of Visible Algal Blooms—Science to Inform the Timing of Algal Toxin Exposure
Understanding Drivers of Cyanotoxin Production in the Lake Okeechobee Waterway
Algal and Other Environmental Toxins — Lawrence, Kansas
Understanding Associations between Mussel Productivity and Cyanotoxins in Lake Erie
New Method Developed to Quantify Spatial Extent of Cyanobacterial Blooms
Satellite Imagery Used to Measure Algal Bloom Frequency—Steps Toward Understanding Exposure Risk
Cyanobacteria from 2016 Lake Okeechobee Harmful Algal Bloom Photo-Documented
Evaluating Linkages Between Algal Toxins and Human Health
- Overview
Study findings indicate that cyanobacteria and cyanotoxins were not associated with mussel mortality at the concentrations present in Lake Erie during a recent study (2013-15), but mussel growth was lower at sites with greater microcystin concentrations.
Sources/Usage: Public Domain.U.S. Geological Survey (USGS) scientists retrieve and process an ecological processing monitoring station. Each station includes a caged native mussel (shown attached to the buoy rope) and a sampler for measuring invertebrate consumers (not shown). Scientists have found that cyanobacteria and cyanotoxins were not associated with mussel mortality at the concentrations present in Lake Erie during a recent study (2013-15), but mussel growth was lower at sites with greater microcystin concentrations. (Credit: Sean W. Bailey, Upper Midwest Environmental Sciences Center) Lake Erie experienced major changes in its cyanobacterial communities in the early 2000s. After being absent for most of the late 1980s and 1990s, cyanobacteria have again become prevalent seasonally in the western basin of Lake Erie, which provides drinking water to large coastal communities. These cyanobacterial blooms have resulted in episodic drinking water shutdowns along Lake Erie and the creation of a large international effort to identify causes and potential management strategies to minimize adverse effects to humans and other organisms.
Lake Erie supports an important commercial and cultural fishery. These fisheries rely in part on production (growth and survival) of mussels in the lake, and there is concern that cyanobacterial blooms and associated cyanotoxins could reduce production of mussels and ultimately affect the fishery.
Cyanobacteria produce several different classes of cyanotoxins, including anatoxin, cylindrospermopsin, microcystin, and saxitoxin. Microcystin is the only toxin known to regularly occur in Lake Erie. Mussels often are not affected by microcystin at concentrations that cause mortality of other organisms such as zooplankton. However, more recent studies have shown that microcystin can cause inflammatory responses and immune system alterations in dreissenid mussels when present either in dissolved form or in the cells of ingested cyanobacteria. This is of particular interest in Lake Erie, where invasive dreissenid mussels comprise the majority of secondary production.
Scientists assessed if cyanobacterial abundance indices and cyanotoxin concentrations were associated with secondary production by mussels in Lake Erie. Three indices of mussel production (growth of a native unionid mussel, the size of young-of-year invasive dreissenid mussels, and the overall mass of colonizing animals on a Hester-Dendy sampler) were measured, and indices of cyanobacterial abundance (biovolume, chlorophyll-a concentration, and cyanotoxin concentration) at 35 stations in the western Basin of Lake Erie during 2013 through 2015.
The results of this study indicate that cyanobacterial abundance and microcystin did not cause mussel mortality at the concentrations detected in Lake Erie during 2013-2015. Measures of cyanobacterial abundance were only weakly associated with the impaired growth of mussels. In contrast, mussel growth was lower at sites with greater microcystin concentrations. This information suggests that in Lake Erie, the poor food quality of cyanobacteria has only a small influence, while microcystin concentration has a larger influence, on mussel growth. Though this study largely reflects effects of cyanobacteria on mussels, rather than all secondary producers, the invasive dreissenid mussels make up a very high proportion of secondary production in the Western Basin of Lake Erie. These mussels do provide resources and a pathway for biomass to move to higher trophic levels in the food web.
This study is part of a larger USGS goal to provide the science needed to understand how to economically and effectively minimize the risk, if any, to the health of humans and other organisms exposed to toxins through inhalation, dermal, ingestion, and other exposure routes. Future steps include the need to understand the mechanisms responsible for reduced native mussel growth associated with microcystin and other cyanotoxins in our Nations water resources.
The USGS Toxic Substances Hydrology Program and the Great Lakes Restoration Initiative funded this study.
- Science
Related science listed below.
Toxins and Harmful Algal Blooms Science Team
The team develops advanced methods to study factors driving algal toxin production, how and where wildlife or humans are exposed to toxins, and ecotoxicology. That information is used to develop decision tools to understand if toxin exposure leads to adverse health effects in order to protect human and wildlife health.Satellite Data Used to Estimate and Rank Cyanobacterial Bloom Magnitude in Florida and Ohio Lakes—Developing Tools to Protect Human and Wildlife Health from Cyanotoxin Exposure
Cyanobacterial bloom magnitude during 2003–11 was quantified and ranked in Florida and Ohio lakes with a newly developed modelling tool that allows for the use of multiple satellite data sources and user-defined thresholds. This tool was designed to identify the magnitude of algal blooms, but one metric alone cannot adequately represent the severity of a bloom of interest in terms of toxicity. The...Mixtures of Algal Toxins Present Prior to and After Formation of Visible Algal Blooms—Science to Inform the Timing of Algal Toxin Exposure
Cyanobacteria with toxin-producing potential, genes indicating an ability for toxin synthesis, or cyanotoxins were present before and after formation of a visible algal bloom in Kabetogama Lake, a popular recreation area in Voyageurs National Park that lies along the border of Minnesota and Canada. The temporal patterns observed in this study indicate that sampling only when there is a visible...Understanding Drivers of Cyanotoxin Production in the Lake Okeechobee Waterway
The U.S. Geological Survey (USGS) and other researchers combined field and laboratory approaches in two studies to understand the factors that drive cyanobacterial bloom development and associated cyanotoxin production in Lake Okeechobee, the St. Lucie River and Estuary, and the Indian River Lagoon in response to the large-scale Lake Okeechobee cyanobacteria bloom in 2016.Algal and Other Environmental Toxins — Lawrence, Kansas
About the Laboratory The Environmental Health Program collaborates with scientists at the Organic Geochemistry Research Laboratory (OGRL) in Lawrence, Kansas, to develop and employ targeted and non-targeted analytical methods for identification and quantitation of known and understudied algal/cyanobacterial toxins. The laboratory contructed in 2019 is a 2,500 square foot modern laboratory facility...Understanding Associations between Mussel Productivity and Cyanotoxins in Lake Erie
Study findings indicate that cyanobacteria and cyanotoxins were not associated with mussel mortality at the concentrations present in Lake Erie during a recent study (2013-15), but mussel growth was lower at sites with greater microcystin concentrations.New Method Developed to Quantify Spatial Extent of Cyanobacterial Blooms
This study provides a method for quantifying changes in the spatial extent of cyanobacterial blooms at local and regional scales using remotely sensed data to determine if bloom occurrence and size are increasing or decreasing for inland water resources.Satellite Imagery Used to Measure Algal Bloom Frequency—Steps Toward Understanding Exposure Risk
Study explores the utility and limitations of currently available remotely sensed satellite data for identifying the frequency of algal blooms in the Nation's lakes and reservoirs. This information provides a first step toward the goal of understanding exposure risk to protect the health of humans, pets, livestock, and wildlife.Cyanobacteria from 2016 Lake Okeechobee Harmful Algal Bloom Photo-Documented
New report provides photographic documentation and identification of the cyanobacteria present in Lake Okeechobee, the Caloosahatchee River, and St. Lucie Canal during an extensive algal bloom in 2016.Evaluating Linkages Between Algal Toxins and Human Health
The amino acid β-methylamino-L-alanine (BMAA) is produced by cyanobacteria and has been suggested by human health researchers as a causal factor for degenerative neurological diseases such as Amyotrophic Lateral Sclerosis (ALS), Parkinsonism, and dementia. An objective review concluded that this hypothesis is not supported by existing data. - Publications